<template>
    <div class="slide-show" @mouseover="clearInv" @mouseout="runInv">
        <div class="slide-img">
            <a :href="slides[nowIndex].href">
              <transition name="slide-trans">
                 <img v-if="isShow"  :src="slides[nowIndex].src" alt="">
              </transition>
              <transition name="slide-trans-old">
                 <img v-if="!isShow" :src="slides[nowIndex].src" alt="">
              </transition>
               
            </a>
        </div>
        <h2>{{slides[nowIndex].title}}</h2>
        <ul class="slide-pages">
            <li @click="goto(prevIndex)">&lt;</li>
            <li v-for="(item,index) in slides" @click="goto(index)">
                <a :class="{on:index === nowIndex}">{{index+1}}</a>
            </li>
            </li>
            </li>
            <li @click="goto(nextIndex)">&gt;</li>
           
        </ul>
    </div>
</template>

<script>
export default {
  props:{
    slides:{
        type:Array,
        default:[]
    },
    inv:{
      type:Number,
      default:1000
    }
  },
  data () {
    return {
     nowIndex:0,
     isShow:true
    }
  },
  // 计算属性
  computed : {
    prevIndex () {
        if(this.nowIndex === 0){
          return this.slides.length-1
        }else{
          return this.nowIndex -1
        }
    },
    nextIndex () {
       if(this.nowIndex === this.slides.length-1){
          return 0
        }else{
          return this.nowIndex +1
        }
    }
  },
  methods:{
    goto (index) {
      // console.log(this.nowIndex);
      this.isShow = false,
      setTimeout(() => {
        this.isShow = true,
        this.nowIndex = index,
        this.$emit('onchange',index)
      },10)
      
    },
    runInv () {
      this.invId = setInterval(()=>{
        // console.log(123);
        this.goto(this.nextIndex)
      },this.inv)
    },
    clearInv () {
      clearInterval(this.invId);
    }
  },
  mounted () {
    this.runInv();
    // console.log(this.slides)
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.slide-trans-enter-active {
  transition: all .5s;
}
.slide-trans-enter {
  transform: translateX(900px);
}
.slide-trans-old-leave-active {
  transition: all .5s;
  transform: translateX(-900px);
}
.slide-show {
  position: relative;
  margin: 15px 15px 15px 0;
  width: 900px;
  height: 500px;
  overflow: hidden;
}
.slide-show h2 {
  position: absolute;
  width: 100%;
  height: 100%;
  color: #fff;
  background: #000;
  opacity: .5;
  bottom: 0;
  height: 30px;
  text-align: left;
  padding-left: 15px;
}
.slide-img {
  width: 100%;
}
.slide-img img {
  width: 100%;
  position: absolute;
  top: 0;
}
.slide-pages {
  position: absolute;
  bottom: 10px;
  right: 15px;
}
.slide-pages li {
  display: inline-block;
  padding: 0 10px;
  cursor: pointer;
  color: #fff;
}
.slide-pages li .on {
  text-decoration: underline;
}
</style>
